I've had something similar. It happens occasionally when I wake it from sleep. The display is washed out and VERY faint and VERY dim. Adjusting the brightness control has no effect on it. I have to put it back to sleep then wake it up again. Is this what you are experiencing?

I've had something similar. It happens occasionally when I wake it from sleep. The display is washed out and VERY faint and VERY dim. Adjusting the brightness control has no effect on it. I have to put it back to sleep then wake it up again. Is this what you are experiencing?

I was concerned that I should report it or return it.

This is a software bug. Happened on my 4S as well as my 5. It's just the screen brightness getting put really low, also happens on my ipad occasionally.